Safe Torque Off (Sto) Safety Function; Function Description - Siemens SINAMICS G120C Operating Instructions Manual

6.8

Safe Torque Off (STO) safety function

These operating instructions describe the commissioning of the STO safety function when it
is controlled via a fail-safe digital input.
You will find a detailed description of all safety functions and control using PROFIsafe in the
Safety Integrated Function Manual, see Section Manuals for your inverter (Page 409).
6.8.1

Function description

How does the STO safety function work?
Table 6- 42
1. The inverter recognizes the selection of STO
2. The inverter prevents energy from being fed to
3. The inverter signals that "STO is active" via a
SINAMICS G120C converter
Operating Instructions, 07/2015, FW V4.7 SP3, A5E34263257B AC
The principle of operation of STO
Safe Torque Off (STO)
via a safety-relevant input or via the PROFIsafe
safe communication.
the motor. When STO is active, the motor does
not generate any torque.
safety-relevant output or via the PROFIsafe
safe communication.
6.8 Safe Torque Off (STO) safety function
The inverter with active STO function prevents machine
components from inadvertently starting.
Standard inverter functions linked with STO
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If you use a motor holding brake, the inverter
closes the motor holding brake.
If you use a line contactor, the inverter opens
the line contactor.
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Advanced commissioning
259